The so-called mahogany is some relatively high-density and hard wood, which is mostly born in tropical areas and grows slowly. The quality of carefully carved works will be better. For example, the green radish, which is also from Tianjin, grows best in that small piece in Shawo Town. Other areas are almost the same. However, not every radish in the sand nest is delicious, and some are still very bad. It's not necessarily bad if it's not a sandpit. This is just a question of probability. Everything grows naturally, and individuals vary greatly, which is only a matter of probability. If it's your hobby, there's really no need to study it unless it's a business, but when it's a business, you don't need to study its nature, just like buying stocks, depending on the market.